Implantation procedure for Real Heart TAH

Henrik C. Ahn

Abstract

The Real Heart TAH (Total Artificial Heart) has shown that artificial valve planes can move silently and effectively inside two pumps, which together comprise a TAH. In this paper we describe the evolution of the surgical procedure for implantation. The first 8 acute implantations of Real heart prototypes were performed with sternotomy using a 60-70 kg porcine model. Due to some limitations observed with this model the technology and the surgical technique have been improved. This paper describes the current implant procedure with the new improved Real heart TAH in a calf model. Keywords: $rtificiDO heart; Assist device; Mechanical circulatory support; Heart failure; Transplantation Introduction A total DrtificiDO heart (TAH) is a device that replaces the heart and is typically used to bridge the time to heart transplantation, or to permanently replace the heart in patients with severe biventricular heart failure [1]. In such a case the more commonly used ventricular assist system supporting the native heart may be insuٹcient to secure an adequate circulation. Нe Realheart TAH is based on a physiological concept originally published by the Swedish cardiologist Stig Lundback [2]. He suggested that downward and upward movement of the atrioventricular valve plane is of utmost importance for the heart function, where fiOOing of the blood from the atria to the ventricles helps the valve plane to return to its upward position. Нis should theoretically be an energ\-eٹcient pumping action. The Real Heart TAH constructed by Dr. Azad Najar, has shown that DrtificiDO valve planes can move silently and e�?ٴectiveO\ inside two pumps, which together comprise a TAH.